exam Maths Puzzle Numerical Ability

set up and splve in a triangle the measure of the first angle is twice the measure of the second angle. The measure of the third angle is 20 degrees less than the second angle. What us the measure of each angle?

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exam Other Question

Could someone explain how to solve this problem by multiplying?

8 x a^3+64
___________
3a+12 x 12
Thanks A right angled triangle PQR is drawn such that QR is Hypotenuse, PQ is Base and PR is Perpendicular. Equilateral triangles are drawn on the sides of the right angled triangle PQR.